The invention discloses an isolating switch body of railway traffic, wherein in a moving contact component structure, a moving contact knife is welded on a conduction plate and mounted on a rotation shaft; a soft connection is formed by respectively fixing two ends which are overlapped by a plurality layers of strip-shaped copper sheets and bended to be U-shaped on a connecting plate; two soft connections are in bilateral symmetry and are fixed between the conduction plate and a T-shaped connecting plate. A static contact component structure is as follows: two locking rods are fixed on a contact knife splint; a plurality of unit clamp-shaped components are hung on the two locking rods; an I-shaped plate is arranged between two adjacent unit clamp-shaped components; the unit clamp-shaped component structure is as follows: two left contact fingers are overlapped and hung on a locking rod, two right contact fingers are overlapped and hung on the other locking rod, pits at external sides of the left and right contact fingers are respectively provided with a cylindrical pin, and a tension spring is hung on an annular groove of two cylindrical pins. The isolating switch body disclosed by the invention has the advantages of good heat dissipation, strong flowing capacity and long service life; and the isolating switch body is suitable for the occasions at which the rated voltage DC is 1800 V and the rated current is 4000 A.